Phase detector

摘要

A phase detector (100, 400, 800) comprising a balun (150) and input ports (116) at each of the balun's balanced ports. The phase detector (100, 400, 800) has four devices (105, 115, 110, 155) for measuring a signal's amplitude: —a first device (105) at a first input port (116), —a second device (115) at a second input port (117), —a third device (110) between the input ports (116, 117), connected to the ports via a passive component (120, 125; 120′, 125; 120″, 125″), —a fourth device (155) at the unbalanced port of the balun (150), The difference between the amplitude values of the third (110) and fourth (155) devices indicate the phase difference and the difference between the amplitude values measured by the first (110) and second (115) devices indicates the phase difference in the region of 0-2π.

主权项

1. A phase detector for detecting a phase difference between a first sinusoid signal and a second sinusoid signal of equal amplitude A, the phase detector comprising a balun and a first input port for the first signal at one of the balanced ports of the balun and a second input port for the second signal at the other of the balanced ports of the balun, the phase detector being equipped with four devices for measuring a signal's amplitude, said four devices being arranged as follows:
a first device at the first input port, a second device at the second input port, a third device at an intermediate point between the two input ports, connected to each of said input ports via a passive component of a first kind, a fourth device at the unbalanced port of the balun, with either the intermediate point or the first and second input ports being connected to ground via a passive component of a second kind, wherein the difference between the amplitude values measured by the third and fourth devices indicate the phase difference and the difference between the amplitude values measured by the first and second devices indicates the phase difference in the region of 0-2π.